Difference between revisions of "Monster carrying capacity"

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(rewrite article based on my reading of the source code and testing in wizard mode)
(→‎Weighty monsters: special rules)
 
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A monster's carrying capacity is determined by the following procedure:
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A monster's '''carrying capacity''' is calculated based on its weight or size relative to a human.{{refsrc|src/mon.c|1185|version=NetHack 3.6.6}}
  
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<math>\text{maxload} = 1000 \times \frac{{\text{cwt}}}{1450}</math>,
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==Weighty monsters==
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If the monster has non-zero weight, its carrying capacity is
  
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where cwt is the monster's [[weight]], if cwt is not 0.  If the monster is [[strong]] and weighs less than a human (1450), then the monster's carrying capacity is set to 1000.
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<math>\frac{{1000 \times \text{monster weight}}}{\text{weight of human}} (\times \frac{1}{2} \text{if not strong})</math>.
  
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For a monster with a cwt of 0, its carrying capacity depends on its [[physical size]]:
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The weight of a human is 1450 for this calculation.{{refsrc|include/permonst.h|34|version=NetHack 3.6.6}}  If a [[strong]] monster would have less than 1000 carrying capacity based on this calculation, then its carrying capacity is set to 1000.
  
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<math>\text{maxload} = \text{msize} \times 1000</math>,
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This can be simplified to <math>\frac{\text{weight}}{2.9}</math> if the monster is not strong, and <math>\frac{\text{max}(\text{weight}, 1450)}{1.45}</math> if the monster is strong.
  
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where msize is 0 for tiny, 1 for small, 2 for medium, 3 for large, 4 for huge, and 7 for gigantic.
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Some monsters have special rules for their carrying capacity:
  
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Finally, if the monster is not strong, then its carrying capacity is divided by 2:
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* [[Nymph]]s have functionally unlimited carrying capacity, although they won't pick up [[boulder]]s or [[statue]]s.{{refsrc|src/mon.c|1294|version=NetHack 3.6.6|comment=The function returns before the nymph's actual carrying capacity is checked.}}
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* [[giant (monster attribute)|Giant]]s can carry any number of boulders.{{refsrc|src/mon.c|1290|version=NetHack 3.6.6}}
  
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<math>\text{maxload} = \frac{\text{maxload}}{2}</math>.{{refsrc|src/mon.c|1185|version=NetHack 3.6.6}}
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==Weightless monsters==
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If the monster has zero weight, its carrying capacity is
  
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Note that despite the source code comment mentioning [[corpseless]] monsters, the formula based on monster size is only used for monsters with a cwt of 0.  Thus, a corpseless [[lich]], with medium (2) size and 1200 weight, has a carrying capacity of 413, not 500.  A [[wraith]], with medium size and 0 weight, has a carrying capacity of 500.
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<math>\frac{1000 \times \text{monster size}}{\text{size of human}} (\times \frac{1}{2} \text{if not strong})</math>.
  
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In effect, the carrying capacity of a non-zero-weight monster is <math>\frac{\text{cwt}}{2.9}</math> if a monster is not strong, and <math>\frac{\text{max}(\text{cwt}, 1450)}{1.45}</math> if a monster is strong.
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The numerical value used for monster size is that used for [[physical size]]: 0 for tiny, 1 for small, 2 for medium, 3 for large, 4 for huge, and 7 for gigantic.  Humans have medium (2) size.{{refsrc|include/monflag.h|165|version=NetHack 3.6.6}}
  
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A few monsters' carrying capacity:
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==Notes==
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Despite the source code comment mentioning [[corpseless]] monsters,{{refsrc|src/mon.c|1196|version=NetHack 3.6.6}} the formula based on monster size is only used for monsters with a ''weight'' of 0.  Thus, a corpseless [[lich]], with medium (2) size and 1200 weight, uses the formula for weighty monsters and has a carrying capacity of 413, not 500.  A [[wraith]], with medium size and 0 weight, uses the formula for weightless monsters and has a carrying capacity of 500.
  
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{|class="prettytable"
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==Examples==
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{|class="prettytable sortable"
 
! Monster
 
! Monster
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! [[kitten]]/[[little dog]]
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! Weight
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! [[housecat]]/[[dog]]
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! Strong?
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! [[hobbit]]
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! Size
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! [[large cat]]/[[large dog]]
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! Carrying capacity
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! [[pony]]
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|-
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! [[dwarf]]
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|[[kitten]] || 150 || No || 1 (small) || 51
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! [[horse]]
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|-
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! [[warhorse]]
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|[[housecat]] || 200 || No || 1 (small) || 68
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|-
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|[[large cat]] || 250 || Yes || 1 (small) || 1000
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|-
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|[[little dog]] || 150 || No || 1 (small) || 51
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|-
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|[[dog]] || 400 || No || 2 (medium) || 137
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|-
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|[[large dog]] || 800 || Yes || 2 (medium) || 1000
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|-
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|[[pony]] || 1300 || Yes || 2 (medium) || 1000
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|-
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|[[horse]] || 1500 || Yes || 3 (large) || 1034
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|-
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|[[warhorse]] || 1800 || Yes || 3 (large) || 1241
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|-
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|[[lich]] || 1200 || No || 2 (medium) || 413
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|-
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|[[wraith]] || 0 || No || 2 (medium) || 500
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|-
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|[[air elemental]] || 0 || Yes || 4 (huge) || 2000
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|-
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|[[mind flayer]] || 1450 || No || 2 (medium) || 500
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|-
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|[[Archon]] || 1450 || Yes || 3 (large) || 1000
 
|-
 
|-
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|Capacity || 52 || 69 || 173 || 1000 || 1000 || 1000 || 1034 || 1241
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|[[dragon]] || 4500 || Yes || 7 (gigantic) || 3103
 
|}
 
|}
  
 
==References==
 
==References==
 
<references/>
 
<references/>
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 +
{{nethack-366}}

Latest revision as of 16:16, 5 February 2023

A monster's carrying capacity is calculated based on its weight or size relative to a human.[1]

Weighty monsters

If the monster has non-zero weight, its carrying capacity is

\frac{{1000 \times \text{monster weight}}}{\text{weight of human}} (\times \frac{1}{2} \text{if not strong}).

The weight of a human is 1450 for this calculation.[2] If a strong monster would have less than 1000 carrying capacity based on this calculation, then its carrying capacity is set to 1000.

This can be simplified to \frac{\text{weight}}{2.9} if the monster is not strong, and \frac{\text{max}(\text{weight}, 1450)}{1.45} if the monster is strong.

Some monsters have special rules for their carrying capacity:

Weightless monsters

If the monster has zero weight, its carrying capacity is

\frac{1000 \times \text{monster size}}{\text{size of human}} (\times \frac{1}{2} \text{if not strong}).

The numerical value used for monster size is that used for physical size: 0 for tiny, 1 for small, 2 for medium, 3 for large, 4 for huge, and 7 for gigantic. Humans have medium (2) size.[5]

Notes

Despite the source code comment mentioning corpseless monsters,[6] the formula based on monster size is only used for monsters with a weight of 0. Thus, a corpseless lich, with medium (2) size and 1200 weight, uses the formula for weighty monsters and has a carrying capacity of 413, not 500. A wraith, with medium size and 0 weight, uses the formula for weightless monsters and has a carrying capacity of 500.

Examples

Monster Weight Strong? Size Carrying capacity
kitten 150 No 1 (small) 51
housecat 200 No 1 (small) 68
large cat 250 Yes 1 (small) 1000
little dog 150 No 1 (small) 51
dog 400 No 2 (medium) 137
large dog 800 Yes 2 (medium) 1000
pony 1300 Yes 2 (medium) 1000
horse 1500 Yes 3 (large) 1034
warhorse 1800 Yes 3 (large) 1241
lich 1200 No 2 (medium) 413
wraith 0 No 2 (medium) 500
air elemental 0 Yes 4 (huge) 2000
mind flayer 1450 No 2 (medium) 500
Archon 1450 Yes 3 (large) 1000
dragon 4500 Yes 7 (gigantic) 3103

References

  1. ↑ src/mon.c in NetHack 3.6.6, line 1185
  2. ↑ include/permonst.h in NetHack 3.6.6, line 34
  3. ↑ src/mon.c in NetHack 3.6.6, line 1294: The function returns before the nymph's actual carrying capacity is checked.
  4. ↑ src/mon.c in NetHack 3.6.6, line 1290
  5. ↑ include/monflag.h in NetHack 3.6.6, line 165
  6. ↑ src/mon.c in NetHack 3.6.6, line 1196


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